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黄力刚 《机械设计与制造工程》2018,(8)
传统的液压机械自动控制器由于普遍采用PID算法来设计,因此大多数在鲁棒性方面存在缺陷。针对这个缺陷,综合国内外相关研究资料,对液压机械自动控制器的算法进行了改进,以H∞控制算法代替传统的PID算法设计了一个液压机械自动控制器,并对该控制器进行了仿真实验。实验结果表明:以H∞控制算法设计的液压机械自动控制器具有较强的鲁棒性,能够达到工程所要求的控制指标。 相似文献
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针对实际工业生产过程中存在的大量串联非线性系统,提出了一种基于紧格式线性化的串联非线性系统无模型自适应控制算法.该算法无需建立被控对象数学模型,仅用输入输出数据来设计控制器,有效避免了非建模动态问题.仿真结果表明该算法具有较强的跟踪性能和鲁棒性. 相似文献
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湿度专家控制系统的设计与实现 总被引:2,自引:0,他引:2
针对湿度控制,设计了一套基于新型单片机AVR为主控制芯片,液晶屏为监控显示单元的自动控制系统,通过对湿度受控对象非线性、时滞性等的特性分析,研制基于专家控制的湿度控制算法,取得了良好的效果.实际应用结果表明:系统运行平稳,人机界面友好,算法通用性强,控制精度高,具有一定的推广价值. 相似文献
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步进电机驱动系统模糊PID仿真分析 总被引:1,自引:0,他引:1
步进电机驱动螺母螺杆机构实现叉车离合器的自动离合,采用优化控制算法以达到离合器快速起动和精准定位的理想效果。针对该驱动系统存在非线性、参数不确定性的特点,建立整个系统的传递函数数学模型,采用模糊自整定PID算法,并用MATLAB进行仿真研究。结果表明:模糊自整定PID较常规PID具有更优的鲁棒性和自适应性,突破了需要编制大量程序的传统方法,用模糊推理的方法可在动态过程中改变PID的参数,该算法为叉车实现自动离合提供了一定的理论依据。 相似文献
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针对采用传统PID控制一类非线性滞后系统难以获得满意的控制效果,提出基于RBF神经网络的PID控制参数自整定的方法.利用具有在线能力的最近邻聚类学习算法,训练RBF神经网络.并引入优化策略对聚类半径进行自动调整,以保证聚类的合理性,从而自适应调整系统的控制参数.仿真结果证明了该控制策略不仅能使非线性滞后系统具有良好的动态跟踪性能,而且具有很好的抗干扰能力和鲁棒性. 相似文献
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Seung Ho Cho 《Journal of Mechanical Science and Technology》1995,9(1):80-90
This paper deals with the robustness issues associated with the feedforward tracking control with respect to unmodeled plant uncertainties. Based on the Diophantine equation, a new discrete time sliding functions has been defined and utilized for the robust feedforward tracking control law. The robustness is achieved by using a sliding function-based nonlinear feedback. As for model/plant mismatches the plant order uncertainty and parameter uncertainty are taken into account for robustness analysis. Noncircular machining has been adopted as an application example of this algorithm. Through computer simulation it has been shown that the robust discrete time tracking control is effective for unmodeled plant uncertainties. 相似文献
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As higher requirements are proposed for the load regulation and efficiency enhancement, the control performance of boiler-turbine systems has become much more important. In this paper, a novel robust control approach is proposed to improve the coordinated control performance for subcritical boiler-turbine units. To capture the key features of the boiler-turbine system, a nonlinear control-oriented model is established and validated with the history operation data of a 300 MW unit. To achieve system linearization and decoupling, an adaptive feedback linearization strategy is proposed, which could asymptotically eliminate the linearization error caused by the model uncertainties. Based on the linearized boiler-turbine system, a second-order sliding mode controller is designed with the super-twisting algorithm. Moreover, the closed-loop system is proved robustly stable with respect to uncertainties and disturbances. Simulation results are presented to illustrate the effectiveness of the proposed control scheme, which achieves excellent tracking performance, strong robustness and chattering reduction. 相似文献
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针对我国的自动操舵仪长期以来都是采用模拟技术设计的问题,介绍了一种以ARM为核心的数字式自动舵的模块化设计方法及相应实验结果。首先介绍了船舶运动控制的野本模型,分析了系统的控制原理,然后根据系统结构框图设计了各功能模块和程序流程图。系统的软硬件均采用模块化设计,自动航向控制策略采用PID控制。系统具有电子罗盘、电罗经、GPS等多种导航信号接口,具有手动、随动、自动等多种控制模式,预留了多种通讯接口,可方便地与其它设备连接。实验结果表明,该设计方案可行。 相似文献
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Variances of the system states or outputs often play vital roles in the problem for performance requirements of many stochastic control systems. For linear stochastic systems, the covariance control technique has been applied to deal with the variance constrained design problem. This paper extends this technique to a class of discrete-time nonlinear perturbed stochastic systems, which are modeled by the Takagi-Sugeno (TS) fuzzy systems. By fuzzy IF-THEN rules, which represent local linear input-output relations, the nonlinear systems can be described by TS fuzzy models. According to the parallel distributed compensation (PDC) concept, the discrete-time nonlinear perturbed stochastic systems can be driven by the linear feedback gains. The purpose of this paper is to provide a method to design an output feedback fuzzy controller, which is based on the upper bound state covariance control technique and PDC concept, for the discrete-time perturbed stochastic systems using TS fuzzy models. 相似文献
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针对使用PID方法对阀控非对称液压缸位置控制中出现的超调问题,以及传统非线性模型预测控制优化求解计算时间较长的问题,提出了一种基于状态反馈线性化的阀控非对称缸模型预测控制方案。首先建立了阀控系统状态空间模型,运用微分几何理论讨论系统可反馈线性化的充要条件,并将非线性系统映射为新坐标空间内的线性系统模型;设计了反馈线性化模型预测控制器(Feedback Linearization Model Predictive Controller, FLMPC),讨论了线性系统下的约束问题,其中由于系统仿真预测时域远小于系统响应时间,对模型预测控制的损失函数加以修正。结果证明,在相同输入情况下,反馈线性化系统与原系统的位置误差满足控制需要,且在保证被控对象快速稳定控制的条件下,对比该算法与非线性模型预测控制的单步计算时间,证明该算法能够缩短计算时间。 相似文献
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Robust tracking of robot manipulator with nonlinear friction using time delay control with gradient estimator 总被引:1,自引:0,他引:1
We propose an enhanced controller to improve the robustness of Time Delay Control (TDC) for a robot manipulator in the presence
of nonlinear friction, such as Coulomb friction. The problem of TDC is first analyzed with TDC as a trajectory control for
a robot manipulator in the presence of nonlinear friction. Gradient estimation is used to solve this problem. The proposed
controller is called TDC with Gradient Estimator (TDCGE). Comparing with a prior research to improve the robustness of TDC,
named TDCSA, the TDCGE is much simpler to design. Through 1 DOF linear motor experiment, it is verified that the TDCGE is
more robust against nonlinear friction than TDC and the TDCGE has a similar robustness to the TDCSA. In addition, it is confirmed
that the TDCGE is easily implemented in the multi degree-of-freedom robot manipulator through a 3 DOF spatial robot manipulator
experiment. 相似文献
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Robot force control is an essential issue in robotic intelligence. There is much high uncertainty when robot end-effector contacts with the environment. Because of the environment stiffness effects on the system of the robot end-effector contact with environment, the adaptive generalized predictive control algorithm based on quantitative feedback theory is designed for robot end-point contact force system. The controller of the internal loop is designed on the foundation of QFT to control the uncertainty of the system. An adaptive GPC algorithm is used to design external loop controller to improve the performance and the robustness of the system. Two closed loops used in the design approach realize the system?s performance and improve the robustness. The simulation results show that the algorithm of the robot end-effector contacting force control system is effective. 相似文献
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针对大吨位惯性摩擦焊机多缸液压顶锻系统强干扰、强非线性的特点,面向多缸系统同步性能的高精度、强抗干扰的要求,基于自行设计的一套具有位置反馈的三缸液压顶锻系统,建立了阀控缸系统以及位置反馈同步系统的动态响应数学模型,并且提出了以伺服阀控液压系统为基础,在偏差耦合控制方式下采用模糊PID对控制参数进行优化的多缸同步控制策略。在MATLAB Simulink中对该控制算法进行仿真研究,并与传统PID控制算法进行对比。结果表明,所设计的控制策略实现了千吨级负载下多缸系统同步误差小于0.05 mm的稳定输出,具有较好的鲁棒性和较高的同步控制精度,为国产大吨位惯性摩擦焊机液压伺服系统提供设计参考。 相似文献